Explosion Mechanism of Core-Collapse Supernovae and Collapsars

We have performed 2-dimensional MHD simulations of collapsars with magnetic fields and neutrino cooling/heating processes. It is found that explosion energy of a hypernova is not obtained from the neutrino heating process. However, strong jet is found when magnetic fields are included, and total energy of the jet component can be of the order of 10⁵² erg, which is comparable to the one of a hypernova.